PV/EB

PV/EB

Pressure/Vacuum Relief Valve

deflagration- and endurance burning-proof

Function and Description

The atmospheric deflagration and endurance burning proof PV/EB type PROTEGO® valve is a highly developed combined pressure/vacuum relief valve for high flow capacities with an integrated flame arrester unit. It is primarily used as a safety device for flame transmission proof in- and outbreathing on tanks, containers and process engineering apparatus. The valve offers reliable protection against excess pressure and vacuum, prevents the inbreathing of air and product losses almost up to the set pressure and also protects against atmospheric deflagration and endurance burning if stabilized burning occurs. The PROTEGO® flame arrester unit is designed to achieve minimum pressure drop with maximum safety. The PROTEGO® PV/EB valve is available for substances of explosion group IIA (NEC group D MESG > 0.9 mm).

When the set pressure is reached, the valve starts to open and reaches full lift within 10% over pressure. This unique 10% technology enables a set pressure that is only 10% below the allowable working vacuum (MAWV) of the tank. After years of development, this typical opening characteristic of a safety relief valve is now also available for the low pressure range.

The tank pressure is maintained up to the set pressure with a tightness that is far superior to the conventional standard due to our state of the art manufacturing technology. This feature is ensured by the valve seats made of high quality stainless steel and with individually lapped valve pallets (1) or with an air cushion seal (2) in conjunction with high quality FEP diaphragm. The valve pallets are also available with a PTFE seal to prevent the valve pallets from sticking when sticky products are used and to enable the use of corrosive fluids. After the excess pressure is discharged, the valve reseats and provides a tight seal.

If the set pressure is exceeded, explosive gas/product-vapour air mixtures are released to the atmosphere. If this mixture ignites, the integrated PROTEGO® flame arrester unit (3) prevents flame transmission into the tank. If additional mixture continues to flow and stabilized burning occurs, the integrated flame arrester unit prevents flashback as a result from endurance burning. The valve is protected and also fulfils its function under this severe service conditions. The spring loaded weather hood opens as soon as the fusible element (4) melts.

The valve can be used up to an operating temperature of +60°C / 140°F and meets the requirements of European tank design standard EN 14015 – Appendix L and ISO 28300 (API 2000).

Type-approved in accordance with the current ATEX Directive and EN 12874 as well as other international standards.

Features and Advantages

  • requires only 10% overpressure to full lift
  • through 10% technology higher set pressures can be used which results in product loss reduction compared to conventional 40% and 100% overpressure technology vents (compare API 2000)
  • increased design flexibility through higher reseating pressures; vents reseat when conventional vent is still discharging costly product or nitrogen
  • high performance seal reducing product loss below EPA’s 500ppm rule preventing environmental pollution
  • the valve disc is guided within the housing to protect against harsh weather conditions
  • can be used as protective system according ATEX in areas subject to explosion hazards
  • FLAMEFILTER® provides protection against atmospheric deflagration and endurance burning
  • FLAMEFILTER® integrated into the valve saves space, weight and reduces cost
  • FLAMEFILTER® protected from clogging through product vapour
  • PROTEGO® flame arrester unit has a low pressure drop
  • flame transmission proof condensate drain
  • maintenance friendly design
  • special design with lifting gear can be purchased

Dimensions

To select the nominal size (DN), please use the flow capacity chart on the following page

DN 50 / 2" 50 / 2" 80 / 3" 80 / 3"
Set pressure≤ +60 mbar> +60 mbar≤ +60 mbar> +60 mbar
Set pressure≤ +24.1 inch W.C.> +24.1 inch W.C.≤ +24.1 inch W.C.> +24.1 inch W.C.
a308 / 12.13443 / 17.44308 / 12.13443 / 17.44
b108 / 4.25108 / 4.25108 / 4.25108 / 4.25
c165 / 6.50165 / 6.50167 / 6.57167 / 6.57
d218 / 8.58218 / 8.58218 / 8.58218 / 8.58Dimensions for pressure / vacuum relief valve with heating jacket upon request
DN 50 / 2" 50 / 2" 80 / 3" 80 / 3"
Set pressure≤ +60 mbar> +60 mbar≤ +60 mbar> +60 mbar
Set pressure≤ +24.1 inch W.C.> +24.1 inch W.C.≤ +24.1 inch W.C.> +24.1 inch W.C.
a308 / 12.13443 / 17.44308 / 12.13443 / 17.44
b108 / 4.25108 / 4.25108 / 4.25108 / 4.25
c165 / 6.50165 / 6.50167 / 6.57167 / 6.57
d218 / 8.58218 / 8.58218 / 8.58218 / 8.58Dimensions for pressure / vacuum relief valve with heating jacket upon request

Dimensions in mm / inches Dimensions for pressure/ vacuum relief valve with heating jacket upon request

PV/EB

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Material selection for housing

Design  BC
HousingSteelStainless Steel
Heating jacket(PV / EB-H-...)SteelStainless Steel
Valve seatStainless SteelStainless Steel
Weather hoodSteelStainless Steel
Design  BC
HousingSteelStainless Steel
Heating jacket(PV / EB-H-...)SteelStainless Steel
Valve seatStainless SteelStainless Steel
Weather hoodSteelStainless Steel

Special materials upon request

Material combinations of flame arrester unit

Design A
FLAMEFILTER® cageStainless Steel
FLAMEFILTER®Stainless Steel
SpacerStainless Steel
Design A
FLAMEFILTER® cageStainless Steel
FLAMEFILTER®Stainless Steel
SpacerStainless Steel

Special materials upon request

Material selection for pressure valve pallet

Design ABCD
Pressure range [mbar]
[inch W.C.]
+2.0 up to +3.5
+0.8 up to +1.4
>+3.5 up to +14
>+1.4 up to +5.6
>+14 up to +210
>+5.6 up to +84
>+35 up to +210
>+14 up to +84
Valve palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE
Design ABCD
Pressure range [mbar]
[inch W.C.]
+2.0 up to +3.5
+0.8 up to +1.4
>+3.5 up to +14
>+1.4 up to +5.6
>+14 up to +210
>+5.6 up to +84
>+35 up to +210
>+14 up to +84
Valve palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE

Special materials and higher pressure settings upon request

Material selection for vacuum valve pallet

Design ABCD
Vacuum range [mbar]
[inch W.C.]
-3.5 up to -5.0
-1.4 up to -2.0
<-5.0 up to -14
<-2.0 up to -5.6
<-14 up to -35
<-5.6 up to -14
<-14 up to -35
<-5.6 up to -14
Valve palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE
Design ABCD
Vacuum range [mbar]
[inch W.C.]
-3.5 up to -5.0
-1.4 up to -2.0
<-5.0 up to -14
<-2.0 up to -5.6
<-14 up to -35
<-5.6 up to -14
<-14 up to -35
<-5.6 up to -14
Valve palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE

Special material as well as higher set vacuum upon request

PV/EB

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Selection of explosion group

MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
> 0,90 mmIIAD
MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
> 0,90 mmIIAD

Special approvals upon request

Flange connection type

EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF
EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF

other types upon request

Design Types and Specifications

Almost any combination of vacuum and pressure levels can be set for the valve. The valve discs are weight loaded. When the difference between the pressure and vacuum exceeds 150 mbar / 60.2 inch W.C., special valve discs are used.
There are two different designs:

Pressure/vacuum relief valve, basic design

PV/EB- –

Pressure/vacuum relief valve with heating jacket (max. heating fluid temperature +85°C / 185°F)

PV/EB- H

Pressure/vacuum relief valve, basic design

PV/EB- –

Pressure/vacuum relief valve with heating jacket (max. heating fluid temperature +85°C / 185°F)

PV/EB- H

Additional special devices available upon request

Settings

Pressure:

+2.0 mbar

+210 mbar

+0.8 inch W.C.

+84 inch W.C.

Vacuum:

-14 mbar

-35 mbar

-5.6 inch W.C.

-14 inch W.C.

Vacuum:

-3.5 mbar

-14 mbar

-1.4 inch W.C.

-5.6 inch W.C.

for presssure up to max. + 150 mbar / 60.2 inch W.C.
Higher and lower settings upon request

PV/EB

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Flow Capacity Chart

The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). Conversion to other densities and temperatures refer to Vol. 1: “Technical Fundamentals”.

PV/EB

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PV/EB

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